I couldn't find a picture of it, but the city also proposed a convertible football/baseball stadium as an alternative. I remember Harold Washington at a press conference showing off a model. It had sliding grandstand sections that would reconfigure depending on whether baseball or football was going to be played. Maybe it was a variation on the domed monstrosity in the picture.

We're lucky that none of those ideas were ever built. We'd be counting the days to see it replaced.